Mods for other Total War games comparable to EB for historical detail

[discens]

Greetings to all forum users.

1) I am a quasi-novice in the Total War world, and since I appreciated the Europa Barbarorum mod very much, I would like to have some advice about mods for other Total War games which can be compared to EB for historical detail and accuracy (I am particularly interested in Medieval 2).

2) Then, I would like to know your opinion about which Total War games are the most historically accurate (or the least inaccurate ) in their original versions, without mods.

3) An unrelated question: do the difficulty settings in EB (and in other Total War games) only affect the AI of enemies, or do they change other values in the game as well (I suppose that they change the probability in battles you choose to autoresolve, and what about the probability of combat in played battles?)

Thank you for your attention and for any replies, and I hope that I haven't strayed off topic with this thread (I posted it here because I thought it was the best place to hear from EB connoisseurs, who can make the above-mentioned comparisons).